It Takes Two by Jenny Holiday

All’s fair in love and war.

Wendy Liu should be delighted to be her best friend’s maid of honor. But after years spent avoiding the bride’s brother – aka the boy who once broke her heart – she’s now trapped with him during an endless amount of wedding festivities. Luckily she’s had time to perfect her poker face, and engaging Noah Denning in a little friendly competition might just prove that she’s over him for good…

Noah Denning is determined to make his little sister’s wedding memorable. But it seems Wendy is trying to outdo him at every turn. Challenging each other was always something he and Wendy did right, so when she proposes they compete to see who can throw the best bachelor or bachelorette party in Sin City, Noah takes the bait – and ups the stakes. Because this time around, he wants Wendy for keeps. And when you’re fighting for love, all bets are off.